Autoren:	Moulas, Evangelos Kaus, Boris Jamtveit, Bjørn
Titel:	Dynamic pressure variations in the lower crust caused by localized fluid-induced weakening
Online-Publikationsdatum:	30-Nov-2022
Erscheinungsdatum:	2022
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	Metamorphism of dry, lower crust within orogens is often localized in shear zones composed of mechanically weaker rocks. Several field-based studies suggest shear zone development is preceded by brittle faults which provide the fluid pathways required for metamorphism and weakening. However, a unifying model which couples long-term geological deformation to fluid migration and metamorphic reactions does not exist. Here, we present a visco-elasto-plastic model where the most pertinent features observed in transformed lower crust emerge from basic mechanical principles during the deformation of a coherent rock volume with associated fluid introduction. These include a strikingly dynamic and heterogeneous pressure distribution in the reacting and deforming rock volumes. Lower crustal pressure variations may reach 1 GPa at the same depth. This will have first order effects on the pattern of fluid migration in the lower crust, and may explain the apparent discrepancies between the relevant tectonic settings and petrologically-inferred burial depths.
DDC-Sachgruppe:	550 Geowissenschaften 550 Earth sciences
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 09 Chemie, Pharmazie u. Geowissensch.
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8437
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Weitere Angaben zur Dokumentart:	Scientific article
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/4.0/
Zeitschrift:	Communications earth & environment 3
Seitenzahl oder Artikelnummer:	157
Verlag:	Springer Nature
Verlagsort:	London
Erscheinungsdatum:	2022
ISSN:	2662-4435
DOI der Originalveröffentlichung:	10.1038/s43247-022-00478-7
Enthalten in den Sammlungen:	DFG-491381577-G